We have rolls of Ampex 499 used tape, BASF-900, in 14 inch and 10 and a half inch rolls, as well as 499, 1/4" 7 inch spools. Most are full rolls, some are spliced well, after removing leader tapes, and works fine, we have run through our Studer to check. 
BASF-900 / $200
AMPEX 499 / $200
AMPEX 456 / $150
AMPEX 499, 7 inch / $100